Detection device and combustion system

Abstract

To enable back fire to be detected more appropriately in a combustion device in which a number of fuel supply ports are present.SOLUTION: A detection device 10 for detecting back fire in a combustion chamber 31 that combusts fuel supplied from a plurality of supply ports, comprises: a light source 12 that outputs incident light to an optical fiber 11 laid around the plurality of supply ports; a conversion unit 13 that receives return light from the optical fiber 11, and converts the received return light into an electrical signal; a calculation unit 14 that analyzes the return light converted into the electrical signal, and calculates a temperature at a predetermined position of the optical fiber 11; and a detection unit 15 that detects back fire in the combustion chamber 31 based on the calculated temperature.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a detection device and a combustion system. [Background technology]

[0002] A detection device is known for detecting flashbacks that occur in gas turbines equipped with combustion devices that use a lean premixed combustion method. Flashbacks are a phenomenon in which a flame advances faster than the speed of fluids such as fuel and air, and the flame advances upstream through the fluid. In principle, flashbacks can occur in gas turbines that use natural gas as fuel, but it is easy to suppress flashbacks by restricting the operating conditions.

[0003] In recent years, there has been an increasing demand for hydrogen-fired gas turbines that use a mixture of natural gas and hydrogen gas, or hydrogen gas alone, as fuel, in order to realize a hydrogen society. Hydrogen gas has a faster burning speed than natural gas. Therefore, in hydrogen-fired gas turbines, flashbacks are more likely to occur than in gas turbines that consume natural gas as fuel gas. Increasing the concentration of hydrogen gas in the fuel gas narrows the conditions under which flashbacks do not occur, making it difficult to completely suppress flashbacks in practical operation.

[0004] In order to suppress flashbacks, combustion devices equipped with multiple burners called cluster burners have been researched. However, as the hydrogen gas concentration of the fuel increases, it becomes difficult to completely suppress the occurrence of flashbacks even when cluster burners are used.

[0005] Patent Document 1 describes a combustor including a plurality of temperature detectors for detecting temperatures in a plurality of combustion zones, and a control device. The plurality of temperature detectors include at least one of a thermocouple and an optical pyrometer. The control device is programmed to determine the occurrence of a flashback condition in the plurality of combustion zones based on signals from the temperature detectors, and to modify the amount of fuel supplied to the premixing device when the flashback condition occurs. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2010-286232 A Summary of the Invention [Problem to be solved by the invention]

[0007] When a combustion device has many fuel supply ports, such as a cluster burner, it is necessary to detect the temperature of each supply port. However, since the space in the combustion device is limited, it is difficult to install a temperature detector in the conventional configuration. Furthermore, in the conventional configuration, large-scale maintenance such as replacing the temperature detector must be performed periodically due to deterioration of the detection accuracy of the temperature detector. Thus, the conventional configuration has room for improvement in terms of appropriately detecting flashback in a combustion device with many fuel supply ports.

[0008] Therefore, an object of the present disclosure is to enable more appropriate detection of flashback in a combustion device having many fuel supply ports. [Means for solving the problem]

[0009] In some embodiments, the detection device comprises: (1) A detection device for detecting flashback in a combustion chamber in which fuel supplied from a plurality of supply ports is combusted, comprising: a light source that outputs incident light to optical fibers installed around the plurality of supply ports; a conversion unit that receives return light from the optical fiber and converts the received return light into an electrical signal; a calculation unit that analyzes the returned light converted into the electrical signal and calculates a temperature at a predetermined position of the optical fiber; a detection unit that detects flashback in the combustion chamber based on the calculated temperature; Equipped with.

[0010] In this way, the detector detects flashback by calculating the temperature at a predetermined position of the optical fiber based on the return light from the optical fiber laid around the multiple fuel supply ports. Therefore, even in a combustion chamber with multiple fuel supply ports such as a cluster burner, flashback at each supply port can be detected over a long period of time by arranging the optical fiber in a limited space without installing multiple sensors.

[0011] In one embodiment, (2) In the detection device of (1), The calculation section may analyze the returned light and calculate temperatures at a plurality of predetermined positions of the optical fiber as the temperature at the predetermined positions.

[0012] In this way, the detector detects flashback by calculating the temperatures at a plurality of predetermined positions on the optical fiber, and therefore, for example, by measuring the temperature at a position where flashback may occur, such as near a fuel supply port, it is possible to detect the occurrence of flashback with high accuracy.

[0013] In one embodiment, (3) In the detection device of (1), The calculation unit is Analyzing the return light continuously measured within a certain time range to identify a position in the optical fiber where a temperature increase of a certain level or more is recognized; The temperature at the identified position of the optical fiber may be calculated as the temperature at the predetermined position.

[0014] In this way, the detection device detects flashback by measuring the temperature at any position on the optical fiber by analyzing the return light continuously measured within a certain time range, and thus it is possible to detect flashback based on the temperature at any position on the optical fiber.

[0015] In one embodiment, (4) In any one of the detection devices according to (1) to (3), The calculation unit may identify a position in the optical fiber based on the difference between the timing when incident light is output from the light source and the timing when the returning light based on the incident light is received, and calculate the temperature at the identified position.

[0016] In this way, the detection device identifies the position of the optical fiber based on the emission timing of the incident light and the reception timing of the returned light, and can measure the temperature at any position in the optical fiber to detect backfire.

[0017] In one embodiment, (5) In any one of the detection devices according to (1) to (4), Further comprising an optical fiber laid around the plurality of supply ports, The optical fiber may be provided on a fuel supply surface in the combustion chamber where the plurality of supply ports are provided.

[0018] In this way, since the optical fiber is provided on the fuel supply surface, flashback can be appropriately detected with a simple structure even in a combustion chamber having many fuel supply ports, such as a cluster burner.

[0019] In one embodiment, (6) In any one of the detection devices according to (1) to (4), Further comprising an optical fiber laid around the plurality of supply ports, The optical fiber may be attached around the plurality of supply ports with an adhesive that is resistant to temperatures higher than the combustion temperature in the combustion chamber.

[0020] In this way, by providing the optical fiber using an adhesive that is resistant to temperatures higher than the combustion temperature, the optical fiber can be fixed in place in a combustion chamber that is heated to a high temperature.

[0021] In one embodiment, (7) In any one of the detection devices according to (1) to (4), Further comprising an optical fiber laid around the plurality of supply ports, The optical fiber may be laid around the plurality of supply ports through a guide formed by welding a hollow metal.

[0022] By passing the optical fiber through a metal guide in this manner, the optical fiber can be fixed in place in a combustion chamber that is heated to a high temperature.

[0023] In one embodiment, (8) In any one of the detection devices according to (1) to (7), The combustion engine may further include a signal output unit that outputs a signal indicating the occurrence of flashback to a control device that controls the supply of fuel to the plurality of fuel supply ports in response to the detection unit detecting flashback in the combustion chamber.

[0024] In this way, upon detection of backfire, the control device that controls the fuel supply is notified of the occurrence of backfire, so that the control device can take control in response to the backfire, such as stopping the fuel supply.

[0025] In one embodiment, (9) In any one of the detection devices according to (1) to (8), The combustion engine may further include a notification unit that notifies a user of the occurrence of flashback in response to the detection unit detecting flashback in the combustion chamber.

[0026] In this way, the user is notified of the occurrence of a backfire upon detection of the backfire, allowing the user to quickly respond to the backfire, such as by stopping the fuel supply, and thereby prevent accidents, etc.

[0027] In some embodiments, the combustion system includes: (10) a combustion chamber that burns fuel supplied from a plurality of supply ports; a detection device for detecting flashback in the combustion chamber; Equipped with The detection device includes: a light source that outputs incident light to optical fibers installed around the plurality of supply ports; a conversion unit that receives return light from the optical fiber and converts the received return light into an electrical signal; a calculation unit that analyzes the returned light converted into the electrical signal and calculates a temperature at a predetermined position of the optical fiber; a detection unit that detects flashback in the combustion chamber based on the calculated temperature; Equipped with.

[0028] In this way, the combustion system detects flashback by calculating the temperature at a predetermined position of the optical fiber based on the return light from the optical fiber laid around the multiple fuel supply ports. Therefore, even in a combustion chamber with multiple fuel supply ports such as a cluster burner, flashback at each supply port can be detected by placing optical fibers in a limited space without installing multiple sensors.

[0029] In one embodiment, (11) In the combustion system of (10), The supply of the fuel to the supply port may be controlled in response to the detection device detecting flashback.

[0030] In this way, the combustion system controls the fuel supply in response to flashback detection, thereby making it possible to prevent accidents caused by flashback. Effect of the Invention

[0031] According to an embodiment of the present disclosure, flashback can be more appropriately detected in a combustion device having many fuel supply ports. [Brief description of the drawings]

[0032] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a combustion system according to an embodiment. [Diagram 2] FIG. 2 is a diagram showing an example of a plate provided in the cluster burner of FIG. [Diagram 3]2 is a cross-sectional view showing an example of a boundary between the cluster burner and the combustion chamber in FIG. 1. [Figure 4] FIG. 1 is a diagram showing an example of a plate provided with optical fibers. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] <Comparative Example> The combustion apparatus according to the comparative example equipped with a cluster burner uses a temperature detector to measure the temperature near each burner to detect the occurrence of flashback and control the supply of fuel and air. If the temperature detector is configured with a thermocouple, then the same number of thermocouples and their wiring is required as there are burners, and it is difficult to install those thermocouples and wiring in a combustion apparatus with limited space. Therefore, in the combustion apparatus according to the comparative example equipped with a cluster burner, it is extremely difficult to properly detect flashback using a thermocouple.

[0034] As another flashback detection method, it is possible to use an optical sensor or a pressure sensor as a temperature detector. However, the sensitivity of these sensors deteriorates due to the adhesion of dirt, including molten metal, inside the combustion device. That is, with use over time, the light receiving surface of an optical sensor becomes less transparent to light. With a pressure sensor, the sensitivity to pressure changes due to dirt on the pressure receiving part. As a result, it is difficult for a combustion device according to the comparative example, which detects flashback using an optical sensor or a pressure sensor, to continue to detect flashback over the long term without large-scale maintenance.

[0035] Thus, the configuration according to the comparative example has room for improvement in terms of appropriately detecting flashback in a combustion device having many fuel supply ports. An object of the present disclosure is to enable a combustion device equipped with a cluster burner to be installed in a limited space within the combustion device and to continue detecting flashback over the long term without extensive maintenance.

[0036] <Embodiment> Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. In each drawing, parts having the same configuration or function are denoted by the same reference numerals. In the description of this embodiment, duplicated descriptions of the same parts may be omitted or simplified as appropriate.

[0037] FIG. 1 is a diagram showing an example of the configuration of a combustion system 1 according to one embodiment. The combustion system 1 includes a detection device 10, a control device 20, and a combustion device 30. The combustion device 30 burns a mixed gas of air and fuel gas. The control device 20 controls the operation of the combustion device 30 regarding the supply of air and the mixed gas, etc. The detection device 10 detects flashback in the combustion device 30. Flashback is when a flame in a combustion chamber 31 advances through a fuel nozzle 323 of a burner 321 in a direction from the combustion chamber 31 toward the inside of the burner 321 (see FIG. 3).

[0038] The combustion device 30 includes a combustion chamber 31 and a cluster burner 32. The cluster burner 32 includes a plurality of fuel supply ports (burners 321) and supplies a mixture of air and fuel gas to the combustion chamber 31. The combustion chamber 31 has a space for burning the mixture of gas supplied from the cluster burner 32. In this embodiment, the fuel is hydrogen gas, but is not limited to this. For example, the fuel may be a mixture of hydrogen gas and natural gas, natural gas, or any fluid that can be used as a fuel.

[0039] The detection device 10 includes an optical fiber 11 , a light source 12 , a conversion unit 13 , a calculation unit 14 , and a detection unit 15 .

[0040] The optical fiber 11 propagates incident light output from the light source 12 and return light corresponding to the incident light. The optical fiber 11 is made of a transparent dielectric material such as quartz glass or plastic. In this embodiment, the detection device 10 includes one optical fiber 11, but the number of optical fibers 11 may be two or more.

[0041] The light source 12 outputs light that is incident on the optical fiber 11. The light source 12 may be configured, for example, by a laser that generates coherent light.

[0042] The conversion unit 13 converts the return light from the optical fiber 11 into an electric signal. The conversion unit 13 may be configured, for example, by a photodiode using a pn junction.

[0043] The calculation unit 14 analyzes the electrical signal of the return light to calculate the temperature at an arbitrary position on the optical fiber 11. In the optical fiber 11, light scattering such as Brillouin scattering or Raman scattering occurs. The frequency shift of the scattered light due to Brillouin scattering depends on the temperature of the optical fiber 11 in the region of the optical fiber 11 where the scattering occurs. In addition, the power of the scattered light due to Raman scattering depends on the temperature of the optical fiber 11 in the region of the optical fiber 11 where the scattering occurs. Therefore, the calculation unit 14 may calculate the temperature around the optical fiber 11 based on the frequency shift amount or optical power of the return light. Depending on the distance from the light source 12, the time from when the detection device 10 receives the incident light to when it receives the return light differs. Based on this time, the calculation unit 14 identifies the position of the optical fiber 11 where the temperature is being measured.

[0044] In this embodiment, the calculation unit 14 calculates the temperature using, for example, the return light due to Brillouin scattered light or Raman scattered light in the optical fiber 11 as the return light for calculating the temperature, but return light based on other sources may be used. However, in a high-temperature area such as around the flame in the combustion chamber 31, the transmission loss of the optical fiber 11 increases. Therefore, in the case of Raman scattered light, the conversion coefficient for converting the optical power to temperature changes, which deteriorates the accuracy of temperature measurement. On the other hand, in the case of Brillouin scattered light, the frequency shift amount is not affected by the transmission loss, so the conversion coefficient for converting the frequency shift amount to temperature remains unchanged, and the accuracy of temperature measurement does not deteriorate. In this way, the temperature index is less likely to change when Brillouin scattered light is used than when Raman scattered light is used. Therefore, the calculation unit 14 may calculate the temperature using Brillouin scattered light as the return light.

[0045] The detection unit 15 detects flashback based on the calculation result of the temperature by the calculation unit 14. Specifically, for example, when the temperature at any position of the optical fiber 11 exceeds a predetermined threshold, the detection unit 15 may detect the occurrence of flashback at a supply port near that position. In response to detecting flashback in the combustion chamber 31, the detection unit 15 may function as a signal output unit that outputs a signal indicating the occurrence of flashback to the control device 20 that controls the supply of fuel to the multiple burners 321.

[0046] In the above configuration, the combustion system 1 includes optical fibers 11 laid around the multiple supply ports of the cluster burner 32, and detects flashback by analyzing return light from incident light into the optical fibers 11 and calculating the temperature at any position on the optical fibers 11. Therefore, the combustion system 1 makes it possible to properly detect flashback in the combustion chamber 31 of the cluster burner 32, which has limited space, for a long period of time without large-scale maintenance.

[0047] Fig. 2 is a diagram showing an example of a plate 322 provided in the cluster burner 32 of Fig. 1. The cluster burner 32 includes a plate 322 having a large number of burners 321 on the output surface of fuel to the combustion chamber 31. Each burner 321 forms a fuel supply port. In the example of Figs. 1 and 2, the cluster burner 32 has a cylindrical shape centered on the axis L-L', but the shape of the cluster burner 32 is arbitrary.

[0048] Fig. 3 is a cross-sectional view showing an example of the boundary between the cluster burner 32 and the combustion chamber 31 in Fig. 1. Fig. 3 shows an enlarged view of a part of the boundary between the cluster burner 32 and the combustion chamber 31. As shown in Fig. 3, the inside of the burner 321 provided on the plate 322 is hollow. Each burner 321 is connected to a fuel nozzle 323 for supplying fuel. The fuel supplied from the fuel nozzle 323 is supplied from the burner 321 to the combustion chamber 31 and combusted.

[0049] Fig. 4 is a diagram showing an example of a plate 322 provided with an optical fiber 11. As shown in Fig. 3 and Fig. 4, the optical fiber 11 is laid on the plate 322 provided with a plurality of burners 321 so as to pass around some or all of the burners 321.

[0050] In Fig. 4, the optical fiber 11 is provided so as to surround a plurality of burners 321 in a circular shape, but the path of the optical fiber 11 is not limited to this. The temperature around the burners 321 is high. Therefore, the optical fiber 11 may be bonded to the output surface (plate 322) of the plurality of burners 321 constituting the cluster burner 32 with a ceramic adhesive having a high heat resistance. Alternatively, the optical fiber 11 may be installed by passing it through a guide formed by welding a hollow metal on the plate 322. Furthermore, the optical fiber 11 may be coated with a metal such as gold to improve heat resistance.

[0051] The control device 20 performs appropriate control to prevent or minimize damage to all gas turbine equipment including the combustion device 30 based on the flashback detection result transmitted from the detection device 10. The control device 20 may be provided, for example, as a fuel supply device that supplies fuel to the burner 321 that constitutes the cluster burner 32. In this case, when the detection device 10 transmits the flashback detection, the control device 20 performs adjustment such as reducing the amount of fuel supplied to the burner 321 or stopping the fuel supply. However, this is not limited thereto, and for example, the control device 20 may be a device that notifies a user of an alarm by sound, light, or the like in response to the flashback detection. Such a control device 20 may be provided as a part of the detection device 10. That is, the detection device 10 may further include a notification unit that notifies a user of the occurrence of flashback by sound, light, or the like in response to the detection unit 15 detecting the flashback in the combustion chamber 31.

[0052] In the above-mentioned configuration, the detection device 10 measures the temperature and detects flashback as follows. The light source 12 inputs light into the optical fiber 11. The conversion unit 13 converts the return light from the optical fiber 11 into an electric signal. The calculation unit 14 may calculate the temperature at a predetermined position of the optical fiber 11 (for example, a position around the burner 321) from the electric signal, and use this as the temperature measurement value of the detection device 10. The detection unit 15 may compare the calculated value of the temperature at the predetermined position with a predetermined temperature threshold value, and determine that a flashback has occurred if the calculated value of the temperature is greater than the threshold value. When a flashback is detected, the detection device 10 transmits to the control device 20 that a flashback has been detected in the burner 321 around the predetermined position. The control device 20 performs appropriate control to prevent or minimize damage to all gas turbine equipment including the combustion device 30 based on the transmission result from the detection unit 15 of the detection device 10.

[0053] As described above, the combustion system 1 includes the detection device 10 that detects flashback in the combustion chamber 31 that combusts fuel supplied from multiple supply ports (burners 321). The detection device 10 includes the optical fiber 11, the light source 12, the conversion unit 13, the calculation unit 14, and the detection unit 15. The light source 12 outputs incident light to the optical fiber 11 that is laid around the multiple supply ports. The conversion unit 13 receives return light from the optical fiber 11 in response to the incident light, and converts the received return light into an electrical signal. The calculation unit 14 analyzes the return light converted into an electrical signal, and calculates the temperature at a predetermined position of the optical fiber 11. The detection unit 15 detects flashback in the combustion chamber 31 based on the calculated temperature.

[0054] Therefore, the detection device 10 can detect flashbacks in multiple burners 321 per optical fiber 11, and the number of sensors and wiring for detecting temperature can be significantly reduced. As a result, even in a combustion device 30 equipped with a cluster burner 32, a temperature sensor can be installed in a limited space in the combustion device 30, and flashback detection is possible. Furthermore, the detection device 10 included in the combustion system 1 measures the temperature of the optical fiber 11 itself and detects flashbacks from the measurement results. Therefore, even if dirt adheres to the surface of the optical fiber 11, the performance of the temperature measurement is not affected, and the detection device 10 can continue to detect flashbacks without large-scale maintenance. Therefore, by using the detection device 10 and the combustion system 1 according to this embodiment, it is possible to continue to detect flashbacks for a long time without large-scale maintenance even if the system is equipped with a cluster burner 32.

[0055] The detection device 10 may analyze the return light, calculate the temperatures at a plurality of predetermined positions on the optical fiber 11 as the temperature at the predetermined position, and detect flashback based on the calculated temperatures. For example, the detection device 10 may calculate the temperature at a position of the optical fiber 11 provided near the burner 321 as the temperature at the predetermined position. Therefore, it is possible to detect the occurrence of flashback with high accuracy by measuring the temperature at a position where flashback may occur, such as near the fuel supply port (burner 321).

[0056] Furthermore, the detection device 10 may analyze the return light continuously measured within a certain time range to identify a position in the optical fiber 11 where a certain temperature rise or more has been observed. The detection device 10 may calculate the temperature at the identified position of the optical fiber 11 as the temperature at the predetermined position. In this way, the detection device 10 detects flashback by measuring the temperature at an arbitrary position, not a predetermined position, of the optical fiber 11 by analyzing the return light continuously measured within a certain time range. Therefore, the detection device 10 detects a temperature rise at a position that is difficult to predict in advance, making it possible to more appropriately respond to malfunctions such as flashback.

[0057] In associating such a position in the optical fiber 11 with a temperature, the calculation unit 14 of the detection device 10 may identify a position in the optical fiber 11 based on the difference between the timing at which incident light is output from the light source 12 and the timing at which return light based on the incident light is received, and calculate the temperature at the identified position. Thus, the detection device 10 can measure the temperature at any position in the optical fiber 11 to detect flashback.

[0058] Furthermore, the detection device 10 may include an optical fiber 11 laid around the multiple burners 321. The optical fiber 11 may be provided on a fuel supply surface where the multiple burners 321 are provided in the combustion chamber 31. Therefore, the detection device 10 can appropriately detect flashback with a simple structure even in a combustion device 30 having many fuel supply ports such as a cluster burner 32.

[0059] The optical fiber 11 may be laid around the plurality of burners 321 by an adhesive that is resistant to a temperature higher than the combustion temperature in the combustion chamber 31. For example, the optical fiber 11 may be adhered to the plate 322 by a ceramic adhesive. Alternatively, the optical fiber 11 may be passed through a guide formed by welding a hollow metal, and laid around the plurality of burners 321. With this configuration, the optical fiber 11 can be fixed even in the combustion chamber 31, which becomes very hot.

[0060] Furthermore, in response to detection of a flashback in the combustion chamber 31 by the detection unit 15, the detection device 10 may output a signal indicating the occurrence of a flashback to the control device 20 that controls the supply of fuel to the multiple burners 321. In response to detection of a flashback, the detection device 10 notifies the control device 20 that controls the fuel supply of the occurrence of a flashback, so that the control device 20 can perform control in response to the flashback, such as stopping the fuel supply.

[0061] The combustion system 1 also includes the above-described detection device 10 and a combustion chamber 31 that combusts fuel supplied from a plurality of burners 321. The combustion system 1 controls the supply of fuel to the burners 321 in response to the detection of flashback by the detection device 10. Therefore, the combustion system 1 can prevent accidents caused by flashback.

[0062] The present disclosure is not limited to the above-described embodiment. For example, multiple blocks shown in the block diagram may be integrated, or one block may be divided. Other modifications are possible without departing from the spirit of the present disclosure. [Explanation of symbols]

[0063] 1 Combustion system 10. Detection Device 11 Optical Fiber 12 light source 13 Conversion section 14 Calculation section 15 Detection section 20 Control device 30 Combustion equipment 31 Combustion chamber 32 Cluster Burner 321 Burner 322 Plate 323 Fuel Nozzle

Claims

1. A detection device for detecting flashback in a combustion chamber in which fuel supplied from a plurality of supply ports is combusted, comprising: a light source that outputs incident light to optical fibers installed around the plurality of supply ports; a conversion unit that receives return light from the optical fiber and converts the received return light into an electrical signal; a calculation unit that analyzes the returned light converted into the electrical signal and calculates a temperature at a predetermined position of the optical fiber; a detection unit that detects flashback in the combustion chamber based on the calculated temperature; A detection device comprising:

2. The detection device according to claim 1 , wherein the calculation unit analyzes the returned light and calculates temperatures at a plurality of predetermined positions of the optical fiber as the temperature at the predetermined positions.

3. The calculation unit is Analyzing the return light continuously measured within a certain time range to identify a position in the optical fiber where a temperature increase of a certain level or more is recognized; Calculating the temperature at the identified position of the optical fiber as the temperature at the predetermined position; The detection device according to claim 1 .

4. 2. The detection device according to claim 1, wherein the calculation unit identifies a position in the optical fiber based on a difference between a timing at which incident light is output from the light source and a timing at which the return light based on the incident light is received, and calculates the temperature at the identified position.

5. Further comprising an optical fiber laid around the plurality of supply ports, The detection device according to claim 1 , wherein the optical fiber is provided on a fuel supply surface in the combustion chamber where the plurality of supply ports are provided.

6. Further comprising an optical fiber laid around the plurality of supply ports, The detection device of claim 1 , wherein the optical fiber is attached around the plurality of supply ports with an adhesive that is resistant to temperatures higher than a combustion temperature in the combustion chamber.

7. Further comprising an optical fiber laid around the plurality of supply ports, The detection device according to claim 1 , wherein the optical fiber is laid around the plurality of supply ports through a guide formed by welding a hollow metal.

8. 2. The detection device according to claim 1, further comprising a signal output unit that outputs a signal indicating an occurrence of flashback to a control device that controls the supply of the fuel to the multiple supply ports in response to the detection unit detecting flashback in the combustion chamber.

9. The detection device according to claim 1 , further comprising a notification unit that notifies a user of the occurrence of flashback in response to the detection unit detecting flashback in the combustion chamber.

10. a combustion chamber that combusts fuel supplied from a plurality of supply ports; a detection device for detecting flashback in the combustion chamber; Equipped with The detection device includes: a light source that outputs incident light to optical fibers installed around the plurality of supply ports; a conversion unit that receives return light from the optical fiber and converts the received return light into an electrical signal; a calculation unit that analyzes the returned light converted into the electrical signal and calculates a temperature at a predetermined position of the optical fiber; a detection unit that detects flashback in the combustion chamber based on the calculated temperature; A combustion system comprising:

11. The combustion system of claim 10 , further comprising: controlling the supply of fuel to the supply port in response to the detection device detecting flashback.

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